Lifting jack



J. J. MiZER.

LIFTING JACK. APPLICAT|0N FILED NOV. 1. 1921.

Patented Nov. 14, 1922. r

' in the form of an integral casting. I v ably mounted Within the housing 10 1s a Patented Nov. 14%, 1922.

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JOSEFH J'. MIZER, OF BACIN'E, "WISCONSIN, ASSIGNOB T0 WALKER MANUFACTURING: 7

COMPANY, OF RACINE,:W ISCO1\TSIN, A. CORPORATION WISCONSIN."

LIF'IING JACK.

Application filed November Myinvention relates to lifting jacks, and

particularly to the arrangement I and construction of the lifting lever. It is the principal object of my invention to provide a simple and efiicient construction by which the lifting pawl is pivotally mounted on the liftng lever upon an axis in close proximity to the axis of the lever,'the mounting of both parts being effected by the use of a steel pin which provides the desired strength and durability. It is another object of my invention to improve devices of this type in sundry details hereinafter pointed out. The preferred means by which I. have accomplished my several objects are illustrated in the drawings and are hereinafter specifi cally described. That which I believe to be new and desire to cover by Letters Patent is set forth in the claims.

In the drawings- Fig. 1 is a vertical section through a lift ing ack embodying my improved construe tion.

Fig. 2 is a. vertical section throughthe pivot end of the lifting lever, showing the liftingpawlmounted thereon so to be supported on the pivot pin of the lever.

Fig. 2-3 is a vertical section taken on line 33 of Fig. 2, and

Fig. 4- is a perspective view of the lifting pawl. q

Referring to the several figures of the drawings in which corresponding parts are indicated by the same reference characters, 10 indicates a standard in the form of a housing rising from a base 11, in the construction shown the standard and base being Slidrack bar 12 provided at its upper end with a weight supporting head 13 of any ap proved type, in the construction shown the rack bar 12 and the head 13 being formed integrally by casting. A holding pawl 14 of any approved type is pivotally mounted by means of a pin 15 in the housing 10 in position to engage the teeth of the rack bar 7, 1921. Serial No. 513,342

12 for holding the rack bar in a raised LClJUStQCl position. As is clearly shown in Fig. 1, the housing 10 is provided with a slot 16 at oneside thereof for insertion of .the lifting lever which is of any approved type, in the cone structionshown being. in the form of a a handle or, bar 18 mounted in its outer hollow casting 17 at its'lower end having J end. As is clearly shown in Fig. 1, the casting 17 isprovidedwith a groove or offset portion 19 at'itsupper edge which is adapted to embrace the lower end of the holding pawl 1d, the provision of-.-the groove serving to increase the throw of the lever as is indicated by the dotted line position of the lever in l. 1

Coming now to the means for mounting the lever 17 in position, 20 indicates a pivot pin extendingthrough a suitable circularopening through the end of. the lever, the ends of the pin beingextended atboth sides of the lever for support within suitable bearings 21. provided by the housing 10, as is shown in Fig. 3. The pin20 is designed to be formed of hardened steel for providing a support of greatstrength and great durability for the lifting'lcver. For providing for the mounting of the lifting pawl 22. .inpr0ximity to the axis of the lever 17, l have provided a rounded groove 23 in one side portion of the pin 20 which is adapted toreceive the rounded end of the pawl 22 so as to provide a support therefor. the pawl 22 is pivotally mounted in position by means of circular disks 24 mounted in the groove 23 at opposite sides of the pawl 22, the disks 24 being provided auxiliary support by suitable hearings in the wall portion of the casting 17. As is best shown in Fig. 3, the disks 24L and the end at the pawl 22 are perforated to provide for the insertion of a pintle 25 by which the pawl 22 is pivotaliy supported in position. As is shown in ig. 2, the pin. 20. is cut away at one side adjacent to the groove'23, as is.

indicated at 26, for permitting the pawl 22 to move tothe desired limit of motion with respect to the lever 17. For holding the pin 20 against rotation with respect tothe lever 17 for the purpose of preventing binding of the pawl 22 with respect to the pin; 20,

I have provided a key 27 mounted in a In the construction shown 7 suitable opening in the pin and the casting 17.

By the use of my construction as above described, I have provided a strong and efficient mounting for the lifting pawl upon the lifting lever. l have not deemed it necessary to show in the drawings or to describe herein the means for effecting cooperation between the lifting lever, the lifting pawl 22, and for the holding pawl 1 It will be understood that any appropriate means may be provided for this purpose.

.l claim:

1'. llnza lifting jack, the combination of a lifting lever having an opening for the reception of a pivot pin, a pin cut away at one side and inserted in saidopening, and a lifting pawl pivotally mounted in position to contact said pin at its cutaway portion for partial support by the pin.

2. in a lifting jaclr, the combination 01 a lifting lever having an opening for the reception of a pivot pin, a pin cut away at one side and inserted in said opening, and a lifting pawl pivotally mounted on said lever in position to contact said pin at its cut-away portion ior partial support by the pin.

3. In a lifting jack, the combination of a lifting lever having an opening for the reception of the pivot pin, a pin having a rounded groove out in'one side portion and mounted in said opening, and a lifting pawl having its end curved to conform to the curvature of said groove pivotally mounted in position in said groove for partial support thereby.

l. In a lifting jack, the combination of thereby, said pin being further cut away adjacent to said rounded groove for permitting the pawl to move to the desired limit of motion with respect to the lever.

5. In a lifting jack, the combination of a lifting lever having an opening for the reception of a pivot pin, a pin cut away at one side and inserted in said opening, a lifting pawl pivotally mounted in position to contact said pin at its-cutaway portion for partial support by the pin, and means for holding said pin against'turning with resp'ectto the lever for preventing binding between the lever and the pawl;

6. In a lifting jack, the combination of a lifting lever having an opening for the reception oi a pivot pin, a pin'havinga rounded groove cut in one side portion and mounted in said opening, a lifting pawl having its end curved to conform to the curvature of said groove pivotally mounted on the lever in position to engage said groove for partial support thereby, and a key mounted in contact with said pin for holding the against turning with respect to the lever for preventing binding between the lever and the pawl.

7. In a lifting jack, the combination of a liftinglever having an opening for the reception of a pivot pin, a pin having a rounded groove cut in one side portion and mounted in said opening, a lifting pawl having its end curved to conform' to the curvature' of' said groove, and means for pivotally mounting said pawl in position in said groove for Josnrn J. MizEn. 

